Crocs Duet Sport Clogs Unisex Navy / Orange M11. Step into the supreme comfort of the Duet Sport Clog. It features dual-density technology to create an extrasoft footbed and a tougher outsole for lasting durability against daily wear and tear. The rugged outsole with deep treads adds extra sporty spirit. Duet Sport Clog Details: Dual density: softer Croslite™ foam inside, more durable Croslite™ foam outside Pivoting heel straps Ventilation ports improve airflow Dual Crocs Comfort™: Blissfully supportive. Soft. Cradling comfort.